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棉 花 学 报 Cotton Science 2008，20(4)：300-305
Regulating Effect of Soil Progressive Drought on Yield of Cotton during Blooming and Bolling Periods Abstract：In this experiment, the effects of water stress on cotton yield was studied by different levels of progressive soil drought on cotton plants during blooming and bolling period . The result showed that, effects of the seed cotton production is number of bolls﹥rate of setting bolls﹥boll wight. It increased number of bolls or seed cotton yield under condition of drought for 10 days after flowering，and reduced the intensity of dry matter accumulation or seed cotton yield of inner bolls in lower branches, and increased the intensity of dry matter accumulation during blooming and bolling periods, or increased seed cotton yield of outer bolls in lower-middle branches and inner bolls in upper branches. The effect of these treatments would go down to 50 days after flowering under condition of drought more than 20 days after flowering. It reduced the quantity of dry matter accumulation in bolls of different position, the opposite preponderance of dry matter accumulation tendency to yield organs, but potential force of seed-cotton yield reduced. Numbers of bolls at different positions were led to reduce 13.71%~24.05%, or average seed-cotton boll weight 4.03%~6.49%. It shows the effect of reducing yield is expansive in lower to upper and inner to outer.It is possible to gain specified compensation of yield.
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